Gamma dosimetry in open air at low level is frequently obstructed by technical means. Present work describes the use and testing of a very sensitive field scintillometer for prospecting, the SPP 3, used as a gamma dosimeter. Unfolding of data is made by a computer. The computation of absorbed dose intensity in the scale from some µrad.h-1 to 1 mrad.h-1 for photons between 50 keV and 2 MeV, is done with an uncertainty less than 20 % and gives informations on spectral distribution.

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